As a kind of precious natural resources, wetland has an important value on biodiversity reservation. Based on the theory of ecological evaluation of wetland, a biodiversity evaluation method including evaluation index system and assignment standard is established and the biodiversity of Paleocoast and Wetland Nature Reserve Zone in Tianjin is evaluated.

温室效应是目前全球性的环境问题,本文介绍了温室效应的机理和温室气体的来源,分析了温室效应的主要生态影响,并探讨了减缓温室效应的措施.

介绍了湿地的定义及其在保护生物多样性、维持区域生态平衡等方面具有的重要意义;借鉴有关区域生态系统评价的理论,选取多样性、代表性、稀有性、自然性、稳定性和人类威胁等指标并进行分级化处理,提出、制定了一套湿地生态评价指标体系.